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Silicon Composite Electrodes with Dynamic Ionic Bonding
Author(s) -
Kang Sen,
Yang Ke,
White Scott R.,
Sottos Nancy R.
Publication year - 2017
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201700045
Subject(s) - materials science , ionic bonding , composite number , anodic bonding , x ray photoelectron spectroscopy , surface modification , chemical engineering , dielectric spectroscopy , nanoparticle , covalent bond , raman spectroscopy , anode , acrylic acid , electrode , silicon , ionic liquid , polymer , composite material , electrochemistry , nanotechnology , ion , organic chemistry , chemistry , catalysis , optoelectronics , physics , optics , monomer , engineering
Silicon (Si) composite electrodes are developed with increased cycle lifetimes and reliability through dynamic ionic bonding between active Si nanoparticles and a polymer binder. Amine groups are covalently attached to Si nanoparticles via surface functionalization. Si composite electrodes are fabricated by combining the Si nanoparticles with a poly(acrylic acid) (PAA) binder. The formation of ionic bonds between amine groups on Si particles and carboxylic acid groups on the PAA binder is characterized by X‐ray photoelectron spectroscopy and Raman spectroscopy. Si composite anodes with ionic bonding demonstrate long term cycling stability with capacity retention of 80% at 400 cycles at a current density of 2.1 A g −1 and good rate capability. The dynamic ionic bonds effectively mitigate the deterioration of electrical interfaces in the composite anodes as suggested by stable impedance over 300 cycles.